Telegraphic communicating system



Spt. 1, 1931. 1v. FQLL 1,821,146

TELEGRAPHIC COMMUNICATING SYSTEM Filed Dec. 17, 1929 2 Sheets-Sheet l Jius/vroa Sept. 1; 1931. J. v. FOLL 1,321,145

TELEGRAPHIC COMMUNICATING SYST EI Filed Dec. 1'7. 1929 2 Sheets-Sheet 2 JO-AN Merv/z. F04

IVI'ENTOIQ Patented Sept. 1, 1931 JOHN vro ror. FOLL, 01? 030213011, ENGLAND TELEGRAIPHIC COMMUNICATING SYSTEM Application filed. December 17, 1929, Serial No.- 414,698, and in Great Britain December 21, 1928.

This invention relates to telegraphic apparatus and has more particular reference to printing telegraph systems of the type generally known as single line printers.

The chief object of the present invention is to obtain with telegraph apparatus similar flexibility of intercommunication between distant points as exists telephonically with out the necessity of establishing an independ cut net-work of private lines and switch boards for telegraphic intercommunication between such points, and a further object is to provide means whereby absolute secrecy and accuracy in telegraphic messages is assured.

The principal feature of this invention consists in the provision of means whereby an existing telephone system may be employed for the transmission of telegraphic messages.

Advantageously a telegraphic transmitter is caused to produce sound .waves which are applied to the transmitter of an existing telephone system and corresponding sound waves are thereby emitted from the remote telephone receiver which are caused to'produce or control electrical impulses for operating a telegraphic receiver sensitive to the tele graphic transmitter.

In the single line printing system as usually employed a keyboard is provided at the transmitting end so that operation of the keys will transmit seriesof impulses which pass through the line to the distant station and set'in operation selective devices which result in the printing of characters corresponding to the keys depressed. At the same time a corresponding record may be printed at the transmitting station;

For the purpose of more fully describing the natureof this invention reference is made to the accompanying drawings wherein Fig. 1 illustrates diagrammatically one form of the invention, Fig. 2 is a modification thereof and Fig. 3 is a still further modification.

A and B represent the usual telephonic apparatus, embodying transmitters A1, B1 and receivers A2132 situated at the stations between which intercommunication is desired. Communication is first established through the telephone exchange system E in the usual manner either by passing the required number orally to amanual operator or by dialling if the calling exchange concerned is automatic. WVhen communication has been established in this manner between the two stations the telegraphic apparatus is brought into use.

This telegraphic apparatus may comprise as shown in Fig. 1 buzzers 0,1) or other sound producing means situated in close proximity to the microphone transmitters, A1, B1 respectively of the telephone system, and controlled from the telegraphic keyboard transmitters T1, T2 which may be of the usual type functioning in amanner'well known in y the art. By way of example the transmitters may function to produce impulses which operate the buzzers G, D in accordance with an equal letter code such as the five unit code in which the time taken to transmit every character is the same.

Microphones F G are situated in close prox imity to the telephonic receivers A2, B2 respectively and thereby receive the sound im pulses generated by the telephonic receivers and such. microphones control printing mech anism P1 P2 which may be of any convenient type'sensitive to the type of signals being transmitted. A printed record of the message is preferably made at the transmitting end at the same time that the message is transmitted. The microphones F, G are tuned so as to be sensitive only to the note or 4 notes generated by the buzzer or buzzers at the remote telephonic transmitter.

In the arrangement shown in Fig. 2 two buzzers C1 C2 may function to transmit impulses over the telephone system from each station In this case each buzzer is tuned to a different noteand the two buzzers are situated in the region of the microphone mouthpiece, the different notes of the buzzer corresponding to the different types of signal elements employed in the telegraphic code.

For receiving impulses transmitted from the buzzers C1 C2 two separate microphones F1 F2 may be provided at each telephone receiver, each of said microphones being tuned so as to besenstive to a different buzzer note.

7 In an alternative arrangement difl'erent buzzer notes corresponding to the different types of signal elements are applied to and received by an aperiodic microphone F3 in Fig. 3 situated near the telephonic receiver A2. The output of this microphone is connected to a number of parallel circuits the number corresponding to the number of different types of signal elements and therefore the number of different buzzer notes each of which circuits is tuned to one of the transmitted notes by means of tuning devices M1 M2, such devices being of any known or approved type.

The incoming impulses before being passed on to the polarized relays or other elements of the printers P1, P2 may be conveniently amplified and for this purpose amplifiers are indicated at H1 and H2. VVhe-re necessary such amplifiers may also incorporate impulse rectifying apparatus and may also function to amplify and/or rectify the impulses delivered from the transmitter to the buzzer or buzzers.

In all systems other than those utilizing an aperiodic microphone at the receiving end each microphone is preferably tuned to be sensitive only to the notes which it is designed to receive so that extraneous vibrations and disturbances are prevented from affecting the operation of the printer.

. The inventon may of course be applied to any telephonic system but is particularly adapted for use by clubs, Stockbrokers, cable and telegraph offices and similar institutions and provides simple and eflicacious means for establishing telegraphic contact between subscribers whilst at the same time maintaining secrecy.

Although this invention has been more par ticularly described as applied to the transmission and reception of telegra hic characters, the, same methods can obviously be employed for the facsimile reproduction of pictures, documents, messages, etc, when used in conjunction with suitable transmitting and receiving apparatus.

Claims 1. The method of passing telegraphic impulses over a telephone network which consists in causing a buzzer which emits a distinctive note to apply sound impulses to a transmitter of the telephone networkand causing the impulses reproduced at the telephonic receiver to be picked up by a microphone which is tuned to be sensitive only to the distinctive transmitted buzzer note.

2. The method of passing telegraphic impulses over a telephone network which consists in utilizing a' keyboard transmitter to produce telegraphic impulses, causing said impulses'to control the operation of a buzzer located inv closeproximity to a telephone transmitter and adapted to emit a distinctive note, picking up the sound impulses reproduced bya remote telephone receiver by means of a microphone which is tuned to be sensitive to the distinctive buzzer note only and causing the electrical impulses produced by the microphone to operate a printing mechanism.

3. Apparatus for communicating between separated stations comprising a tuned buzzer located in close relation to the mouthpiece of a transmitter in a telephone network, means for causing said buzzer to emit audible impulses, reproducing said impulses from a receiver in the telephone network at the distant station, a microphone tuned to be sensitive to the transmitted buzzer note only and adapted to receive said reproduced impulses and a printing mechanism actuated by said microphone.

4. In apparatus for communicating be tween separated stations of a telephone network, the combination with a transmitter at one station and a receiver at another station, of a keyboard tele razph transmitter at the sending station, a iouzzer adapted to emit notes of a distinctive nature controlled by the said telegraph transmitter and located close to the telephone transmitter so as to apply thereto the iinpulses which it emits, a microphone tuned to the buzzer note and located adjacent to the telephone receiver at the receiving station so as to receive the impulses transmitted over the network from the said buzzer at the sending station, and a printing mechanism controlled from the said microphone.

-"'5. The method of communicating between distant stations which consists in first establishing connection between the two stations over a telephone network, then applying so'undimpulses to one of the telephone transmitters by means of a buzzer which emits a distinctive note, reproducing said sound impulses from the telephonic receiver at the other station by a microphone tuned to the buzzer note and causing the reproduced impulses to operate a printing device.

6. Apparatus for the transmission of telegraphic imp'ulses over a telephone network comprising a plurality of buzzers at the transmitting station each adapted to emit a distinctive note and all of said buzzers being located in sound transferring relation to a transmitter in the telephone network, means for reproducing the various notes at a remote telephone receiver, a plurality of microphones each tuned to be sensitive to one of the transmitted notes and printing mechanism actuated by the received impulses.

7. Apparatus for the transmission of telegraphic impulses over a telephone network comprising a keyboard telegraph transmitit ter, two tuned buzzers controlled by said telegraph transmitter and located in sound transferring relation to a transmitter of the telephone network, two microphones in sound transferring relation with a' receiver of the igs telephone network and receiving the various impulses passed over said telephone network, said microphones being each tuned to be sensitive to one of said distinctive buzzer notes and a printing mechanism controlled by said impulses.

8. Apparatus for the transmission of telegraphic impulses over a telephone network comprising a telegraphic transmitter, a plurality of buzzers controlled by said transmitter each adapted to emit a distinctive note, means for applying the sound vibrations emitted by said buzzer to a transmitter of the telephone network, means for reproducing the distinctive notes passed over the telephone network at a remote receiver comprising an aperiodic microphone in connection with a number of tuned circuits, each sensitive to one of the transmitted buzzer notes, and a printing mechanism fed by said tuned circuits.

9. Apparatus for the transmission of telegraphlc messages over a telephone network comprising two tuned buzzers in sound transferring relation with a transmitter of the telephone network, a telegraphic keyboard transmitter adapted to control said two buzzers, an aperiodic microphone associated with the receiver at the remote telephone station, the circuit leading from said microphone being branched and both branches being tuned so as to be sensitive to one of the transmitted buzzer notes and printing mechanism oneratcd by the transmitted impulses.

JOHN VICTOR FULL. 

